.layout .header {
  height: 50px;
  background-color: skyblue;
}

.layout .header span {
  padding: 10px 20px;
  cursor: pointer;
  line-height: 50px;
}

.layout .header span.on {
  color: blue;
}

.layout .nav span {
  display: inline-block;
  padding: 10px 20px;
  cursor: pointer;
}

.layout .nav span a {
  text-decoration: none;
}

.layout .nav span .on {
  color: red;
}
